... *Stroke(mm)159*159Dispacement(L)50.3Compression Ratio14.9:1Frequency Regulation,Stead StateMechanical Speed governing ratio 5%,Electronic Speed governing ratio ... class insulation,IP22,AVR 440,12 Winding Leads Voltage Regulation ± 1.0% with 4% engine governing Waveform Distortion No Load < 1.5 ...